<template>
  <view>
    <!-- 轮播图 -->
    <swiper indicator-dots="true" autoplay="true" circular="true" interval="1500">
      <swiper-item v-for="(item,i) in goodsDetail.pics" :key="i">
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>
    
    <!-- 产品信息 -->
    <view class="goods-info-box" v-if="Object.keys(goodsDetail).length">
      <!-- 商品价格 -->
      <view class="price">
        ￥{{ goodsDetail.goods_price }}
      </view>
      
      <!-- 信息主体区域 -->
      <view class="goods-info-body">
        <!-- 商品名称 -->
        <view class="goods-name">
          {{ goodsDetail.goods_name }}
        </view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费 -->
      <view class="yf">
        快递：免运费 {{total}}
      </view>
    </view>
    
    <!-- 产品详情 -->
    <rich-text :nodes="goodsDetail.goods_introduce"></rich-text>
    
    <!-- 购物导航 -->
    <view class="goods-nav" v-if="Object.keys(goodsDetail).length">
      <!-- fill 控制右侧按钮的样式 -->
      <!-- options 左侧按钮的配置项 -->
      <!-- buttonGroup 右侧按钮的配置项 -->
      <!-- click 左侧按钮的点击事件处理函数 -->
      <!-- buttonClick 右侧按钮的点击事件处理函数 -->
      <uni-goods-nav :fill="true"  :options="options" :buttonGroup="buttonGroup"  @click="onClick" @buttonClick="buttonClick" />
    </view>
  </view>
</template>

<script>
  import { mapState, mapMutations , mapGetters} from 'vuex'
  export default {
    computed: {
      ...mapState('m_cart', ['cart']),
      ...mapGetters('m_cart', ['total'])
    },
    
    // 添加 watch 监听器, 监听 total 变化
    watch: {
      // total (newTotal) {
      //   this.options[1].info = newTotal
      // }
      // 解决首次加载 watch 监听器没有执行
      total: {
        handler (newTotal) {
          this.options[1].info = newTotal
        },
        immediate: true
      }
    },
    
    data() {
      return {
        goodsDetail: {},  // 产品详情
        options: [{
                  icon: 'shop',
                  text: '店铺',
                  info: 0,
                  infoBackgroundColor:'#007aff',
                  infoColor:"red"
              }, {
                  icon: 'cart',
                  text: '购物车',
                  info: 0
              }],
              buttonGroup: [{
                text: '加入购物车',
                backgroundColor: '#ff0000',
                color: '#fff'
              },
              {
                text: '立即购买',
                backgroundColor: '#ffa200',
                color: '#fff'
              }
              ]
      };
    },
    
    onLoad(options) {
      const goods_id = options.goods_id
      
      // 调用获取产品详情的方法
      this.getGoodsDetail(goods_id)
      
      // 初始化购物车徽标
      // this.options[1].info = this.total
    },
    
    methods: {
      ...mapMutations('m_cart', ['addToCart']),
      // 获取产品详情
      async getGoodsDetail (goods_id) {
        const { data: res } = await uni.$http.get('/goods/detail', { goods_id} )
        // 响应异常判断
        if (res.meta.status !== 200) return uni.$showMsg()
        // 赋值数据到 data
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="vertical-align: middle;"').replace(/webp/g, 'jpg')
        this.goodsDetail = res.message
      },
      
      // 点击预览轮播图
      preview (i) {
        uni.previewImage({
          urls: this.goodsDetail.pics.map(item => item.pics_big),
          current: i
        })
      },
      
      // 购物导航左边
      onClick (e) {
        console.log('左边', e)
        if (e.content.text === '购物车') {
          // 跳转到购物车页面
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },
      
      // 购物导航右边
      buttonClick (e) {
        console.log('右边', e)
        if (e.content.text === '加入购物车') {
          // 加入购物车数据到 store的cart模块中
          const goods = {
            goods_id: this.goodsDetail.goods_id, // 商品id
            goods_small_logo: this.goodsDetail.goods_small_logo, // 商品图片
            goods_name: this.goodsDetail.goods_name, // 商品名称
            goods_price: this.goodsDetail.goods_price, // 商品价格
            goods_count: 1, // 商品数量
            goods_state: true // 商品选中状态
          }
          this.addToCart(goods)
        }
      }
    }
  }
</script>

<style lang="scss">
  swiper {
    height: 750rpx;
    image {
      width: 100%;
      height: 100%;
    }
  }
  
  .goods-info-box {
    padding: 10rpx;
    padding-right: 0;
    .price {
      color: #c00000;
      font-size: 18px;
      margin: 10px 0;
    }
    .goods-info-body {
      display: flex;
      justify-content: space-between;
      .goods-name {
        font-size: 13px;
        padding-right: 10px;
      }
      .favi {
        width: 120px;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        border-left: 1px solid #efefef;
        color: gray;
      }
    }
    .yf {
      margin: 10px 0;
      font-size: 12px;
      color: gray;
    }
  }
  
  .goods-nav {
    position: sticky;
    bottom: 0;
    z-index: 99;
  }
</style>
